Have added them to my business contacts.
I've only been using them for a couple of weeks but the fit is good and they are as good as OEM.
Solution lid assembly. Fits Nilfisk Advance BA 750ST, BA 850ST, CMAX 28ST, Convertamax 20/26
Fits Nilfisk Advance 56397021 (alt # 56397021)This part is listed as fitting the following models: